Telegraphy.



" NTE @FETES PATENT FFlQE,

BENJAMIN P. HAYES, OF TOPEKA, KANSAS.

TELEGRAPHY.

To all whom it may concern:

Be it known that l, BENJAMIN l). lwlarns, a citizen ot the United States, residing at rlopeka, in the county ot Shawnee and State of Kansas, have invented certain new and useful improvements in Telegraphy, and l do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and ligures of reference marked thereon, which form a part of this specification.

My invention relates generally to telegraphy, and more particularly to certain devices in connection with telegraphic apparatus.

The object of the present invention is to provide novel means for dispensing with local sources of current for energizing local circuits, by utilizing the main line current tor that purpose. rlhis object is accomplished by the means illustrated in the accompanying drawings, in which Figure l is a circuit diagram for one station, omitting the receiver, showing connections whereby the relay closes the line circuit on down strokes, and Fig. H is a similar diagram showing connections whereby the relay opens the line circuit on down strokes.

Referring more in det-ail to the parts:- In each of the figures, the numeral 1 designates a line wire; 2, a ground connection; R, a relay; K, a mechanical key ot the type disclosed in my prior application, Serial Number 458,888, tiled Uct. 21, 1908; and A., a manually operable key which may on occasion be used tor transmitting messages instead of the mechanical key.

l have shown the mechanical key K simply to illustrate the tact that the invention is primarily intended tor use with such keys.

The line 1 is broken to provide contact points 3 for the reception oi' a liack plug 1, by which the transmitter may be cut in. The receiver is not shown, as it is not necessary to the understanding of the invention.

As shown in Fig. I, one terminal ot the jack plug 4 is connected by a wire 5 with both keys K and A, by branches 5 and 5". The opposite poles of the keys are connected by a wire 6. The relay, R, in Fig. I,

Specification of Letters Patent.

Application tiled May 17, 191.0.

.T )atcnted Mar. 28, 1911..

Serial No. 561,791.

comprises a. magnet 7, a titled member 8, and a vibrating arm 9 pivoted at 10; also contact points 12, and a retracting spring 123. llire G is connected to the magnet coil 'T by a wire 141-. From the other magnet terminal, wire lo leads to a variable resistance, 1G, termed of a bare conducting strip or wire, arranged in helical or zigzag fashion. Contacting this conductor, and movable along the same, is a contact shoe r slide 1'?, having either flexible or sliding connection with a wire 18, which leads to one of the relay points 12. From wire 18, a branch 19 leads to the jack plug` 4l, to the terminal opposite that to which the wire 5 is connected. From the relay arm 9, a wire 20 leads to the wire 5 and thereby connects with the arm or key A, and is `grounded, as shown at 2. lt will be observed that the contacts 12 are normally open, and that the variable resistance 16 is in series with the relay winding. ot the machanical key K is a pivoted arm 21, having secured thereto a lower arm 22 that is adapted to be engaged by the longitudinally movable character bar 28 which is provided with alternate projections and recesses. as shown. The key is operated by moving the character bar 23 b v suitable mechanism, it being understood that there are as many character bars as there are letters gures and symbols to be trans mitted and that the key A is operable by any one of such character bars. Whenever key K or A is closed, the relay It will be energized and will draw down its arm 9 thereby closing a circuit at 12, 12, between the line 1 and ground The function of the variable resistance 16 is to weaken the high pressure line current, to provide a voltage suitable tor the apparatus in the local circuit. The stronger the current may be, the greater the resistance that is introduced. by moving the slide 17 toward the lett. llVhen weaker currents are used the slide 17 is moved nearer to the right hand end of the range. Normally when no mes sage is being sent, the jack 4; is out, but this does not prevent the receiving of messages, as a receiver (not shown) is always in series with the line 1. `When a message is to be transmitted the jack 4 is inserted and key A or K is operated.

ln Fig. Il, the relay R is so arranged as The movable elementv characters as in Fig. I, have the saine connections as therein. In the modified arrangement, a wire leads from the ack 4 to a contact point of the relay; and from this Wire 25 a branch 26 leads to the Variable resistance Contact member 17. As inthe first instance, one pole of key K is connected to one pole of key A, by a Wire 6. Wire ('3 is connected to the relay coil 7 at 27, and to the variable resistance 1G by Wire 28. The other terminal oi the relay coil is connected to the relay arm 29 through the medium of the Wire and metallic member 3l. As already stated, the relay E 7 will open the circuit by its down strokes and close it by the alternate strokes. The resistance element 1G is shunted around the relay Winding. The keys K, A, being connected With said resistance, by wires 6, 28, it follows that when either of said keys is closed, currentvfill divide, and a portion will flow through said resistance to the line, While a portion will flow through the relay R to line. The line circuit is thus closed by relay points l2. It will be evident then that the strength of J[he current in the relay coil may be adjusted, or adapted by adjusting the variable resistance member 17. As soon as the jack plug 2l- (Fig. II) is inserted, the relay contacts l2 will close for an instant, but Will immediately reopen, as magnet 7 is energized; current passing through Wires 25, 26, resistance 1G, Wires 28, 6 and 27, magnet 7 Wire 80, frame 3l and Wire 20 to ground. Relay contacts l2 are normally open While the keys are open, as the magnet 7 is normally energized While the plug l is connected with the line.

I-Iaying thus described my invent-ion, What I claim as new therein and desire to secure by Letters-Patent isz- In telegraphy, a line Wire having ack contacts, a local circuit having a ack plug adapted to cut the local circuit into the line, a direct connection from one side of said plug to ground, a relay, a variable resistance, a key, a line from the other side of said plug to one relay contact and to the variable resistance, a connection between the Variable resistance and the relay uf'inding, a connection between the relay Winding and the key, and a connection between the key and boththe jack plugy and the ground.

In testimony whereof I aliix my signature in presence of two witnesses.

BENJAMIN l?. HAYES.

Witnesses EDWIN I-I. PETERSON,

C. D. IVELLMAN.

Copies of this patent may be obtained for 'five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

